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Chapter 2 ■ Security by Design Least Common Mechanism Pattern In Figure 2-5, both the internal and external user accounts are in the same user store. It’s always recommended that you keep external user accounts in a different user store. Ideally, this should be a separate physical user store, as in Figure 2-7. Then you don’t need a connection between the green zone and the yellow zone, because you can keep the user store with internal users in the green zone. The principle of least common mechanism concerns the risk of sharing infrastructure among different components.

You’ve exported both the public and private keys. cert. pem 9. You’re all set. Use the following cURL command to invoke the API. –k is used here to accept any server certificate. Otherwise, you have to specify the CA certificate corresponding to the server’s public certificate. pem https://localhost:8443/recipe ■ Note PKCS is a set of standards for public-key cryptography that focuses on 15 areas, from PKCS #1 to PKCS #15. 509 certificates, in a single file.

The server uses the fourth key to encrypt outgoing messages, and the client uses the same key to decrypt all incoming messages. ■■Note Before you begin working on the examples in this chapter, be sure you have set up the example “Cute-Cupcake Factory: Deploying the Recipe API in Apache Tomcat,” in Chapter 3. SECURING AN API WITH TLS MUTUAL AUTHENTICATION You’ve already deployed the Recipe API from the Cute-Cupcake factory in Apache Tomcat. To enable TLS in Apache Tomcat, first you need to have a keystore with a public/private key pair.